Activity and stability of alumina zeolite nickel catalysts

The catalytic properties of nickel catalysts (50 wt.% of alumina and 50 wt. % of Ni,H-ZSM-5) were investigated and related to the amount of NiO (0-8 wt . %) and the method of nickel incorporation (8 wt.% NiO). Consideration was also given to the method by which zeolite and alumina were combined. The c racking properties of the catalysts increased when the amount of NiO was ra ised up to 4 wt.%. To decrease the content of aromatic hydrocarbons in the products it is necessary to raise the amount of NiO to a higher level than 4 wt.%. The catalyst prepared by peptisation of the mixture of zeolite and aluminium hydrogel (with ageing process) displayed reduced activity and sta bility because of the low susceptibility of NiO to reduction: (C) 2001 Else vier Science B.V. All rights reserved.